Slip ring motor fundamentals brighthub engineering. Working principle of an induction motor circuit globe. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field. Free download induction motor seminar ppt, pdf report. The basic idea of an electric motor is to generate two magnetic fields.
In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring rotor, whereas in most of. The torque of the induction motor depends on the rotor resistance. A slip ring induction motor can be started with external resistance added in its rotor circuit. Maximum starting can be attained in the slip ring motor compared to squirrel cage motor by inserting an external resistance in each phase of the rotor circuit and cutting the resistance during starting speeds can be adjusted in the case of slip. Because of various advantages like low initial current, high starting torque, and improved power factor, it is used in applications that require high torque, cranes, and elevators.
Sep 18, 2018 induction motors have been ruling the industrial world for many decades. Adjusting the resistance allows control of the speedtorque characteristic of the motor. Let see the construction of squirrel cage induction motor. Starting and control of slipring induction motors5 97 the use of wound motors is on the wane, for reasons of inherent advantages of a squirrel cage motor over a wound motor and the availability of static drives which can make a squirrel cage motor perform the same duties as a wound motor and even better. With neat diagrams explains the working of any two types of starters used for squirrel cage type 3 phase induction motor. Induction motor basics, single phase and three phase. Ppt induction motor powerpoint presentation free to. Learn more about the construction and operation of a slip ring induction motor. Slip ring motor manufacturer menzel provides shortterm availability and adaptation, applicationspecific requirements and worldwide logistics. Also know about the qualities of slip ring induction motors. While slip ring induction motors also known as woundrotor motor arent as popular as. Slip ring induction motor construction, working and its.
Most of the industries prefer these type of motor due to less maintenance cost, higher efficiency, and their lightweight construction. Compared to squirrel cage rotor the rotor construction is not simple. The surfacecooling principle in slip ring induction motors ic 411 the standard threephase slip ring induction motor in protection class ip 55 has ic 411 cooling. It is very commonly used in industries because it is very cheap, robust, efficient, and reliable. The rotor will constantly be turning to align its magnetic field with that of the stator field. Synchronous motor mainly runs on principle of magnetic locking between rotor and rmfrotating magnetic field. The slip ring rotor was developed after a decade or so. The tendency of the rotor teeth to remain under the stator teeth due to direct magnetic attraction is reduced. Jun 01, 2018 slip in induction motor is the relative speed between the rotating magnetic flux and rotor expressed in terms of per unit synchronous speed. Starting of slip ring induction motor explained in an easy. This rotating magnetic field has a speed which is known as the synchronous speed. A 3 phase induction motor can be used for different applications with various speed and load requirements. Explain the rotor rheostat control of 3 phase slip ring.
I will tell you about the construction of wound rotor induction motor in the first section. This article is devoted to slip ring induction motors. What is the working principle of slip ring induction motor. Wound rotor induction motor the engineering projects. A simple explanation of squirrel cage induction motors. The slip ringsbrushes allow external resistors to be connected in series with the winding. Proposed circuit diagram of the traction drive system using wrim traction rectifier. Squirrel cage rotor wound type rotor or slip ring type rotor squirrel cage rotor in this type. A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. Stepper motor is an actuator transforming electric pulse into angular displacement.
We can react very quickly due to a comprehensive stock of slip ring motors in a power range up to 15000 kw. Oct 10, 2016 a wound rotor induction motor is also known as slip ring induction motor. If instead of taking mechanical power from the rotor, the rotor is driven by a prime mover such as the wind, it can be moved faster than the synchronous speed and starts producing electrical power instead of consuming it. Introduction types of electrical machines types of 3ph induction motor basic principle working principle compnents of induction motor application comparision between 1ph i. These motors are usually started with full line voltage applied across its terminals. Jul 25, 2019 squirrel cage induction motor working principle. Stator winding can be either star or delta connected depending upon the design. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements. The stator of an induction motor is, in principle, the same as that of a synchronous motor or. The speed of rotating magnetic field is synchronous speed, n s r. In short, it works based on the principle of electromagnetic induction. The principle of operation of the induction machine is based on. An887, ac induction motor fundamentals microchip technology.
Ball and roller bearings are used to suit heavy duty, torublefree running. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. Explain the rotor rheostat control of 3 phase slip ring induction motor. When three phase supply is given to the stator winding, a rotating magnetic field of constant magnetic field is produced. These motors have much higher efficiency than slip ring induction motors. For induction motors a very important parameter is the slip of the motor the slip, s, defines the relative speed difference between synchronous speed and rotor speed and is given by. But at the starting of the induction motor, starting current is very large which may damage motor windings.
Induction motor works on the principle of electromagnetic induction. The rotor is separated from the stator by a small airgap which ranges from 0. Working principal of three phase induction motor electrical. An induction motor is the most modest electrical machine from constructional point of view, in the majority of the cases. In slip ring induction motors the rotor is wound type. A woundrotor motor, also known as slip ring rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. The induction motor is started by itself that we know. Rotor as the name suggests it is a rotating part of an electrical machine, in which current is induced by transformer action from rotating magnetic field. Starting of slip ring induction motor explained in an easy manner.
As discussed earlier, a slip ring induction motor is an asynchronous motor, as the rotor never runs in synchronous speed with the stator poles. Thus, the basic induction motor becomes an induction generator. As these motors have external resistance connected to its rotor circuit, the value of starting current is adjusted or kept minimum, by increasing the resistance of the rotor circuit. Popularly, when receiving a pulse signal, the stepper motor will rotate a fixed angle namelystepping angle according to the direction set for the stepper motor. A 3 phase induction motor has two main parts i stator and ii rotor. When the stator windings are supplied with threephase alternating current, a rotating magnetic field is generated between the stator and the rotor. The stator is the outer component of the motor which can be seen. Read here to know about the starting arrangement and the role played by the external resistances in obtaining better starting characteristics. In the second section, i would be throwing light on the operation and working principle of wound rotor induction motor. Wound rotor induction motor as the slip power recovered can be used to. When a 3 phase supply is given to the stator winding it sets up a rotating magnetic field in space. Enter your email below to receive free informative articles on electrical. The topic lies under the basic electrical and electronics engineering course that covers various other.
At noload, the slip is nearly zero slip ring induction motor working in the induction principle. Advantages and disadvantages of slip ring induction motor. In these type of motors, the rotor is simplest and most rugged in construction. Motor runs smoothly as the magnetic hum is reduced b. The rotor will constantly be turning to align its magnetic field with the stator field. Cylindrical laminated core rotor is wound like winding on the stator. Slip ring induction motor working principle electrical mastar. The rotor winding terminals are connected to three slip rings which turn with the rotor. When the 3 phase supply is provided to the stator, a magnetic field is produced which rotates the rotor and motor starts. An induction motor can be defined as the ac electric motor device in which a power source fed by the alternating current with the help of a primary winding. By putting resistance in series with the rotor windings, the starting current can be kept low while maintaining good starting torque. As the torrent of water dried up for the first time in thousands of years.
The construction of a stator is the same for both the squirrel cage and slip ring induction motor. Slip ring induction motor is one of the types of 3phase induction motor and is a wound rotor motor type. Jan 15, 2014 watch this video to understand the working principals of the three phase induction motors. What are the specific applications of squirrel cage and. By putting resistance in series with the rotor windings, the starting current can be kept low while mainta. A motor is an electromechanical device which converts electrical energy to mechanical energy. In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring rotor, whereas in most of the other applications you will see a simpler, squirrel cage type of rotor. The slipring motor or woundrotor motor is a variation. The value of slip in induction motor is can never be zero. The stator of slip ring induction motor is very much the same as that of the squirrel cage induction motor, but the construction of its rotor is very much different.
The principle of working of squirrel cage and slip ring induction motor is based on faradays law of electromagnetic induction. The 3phase set of currents, each of equal magnitude and with a phase. Synchronous motor working principle instrumentation tools. The slip ring induction motor working in the induction principle. Three phase slip ring induction motor my tech info. Explain starting methods of 3 phase induction motor. Induction motors have been ruling the industrial world for many decades. Induction motor works on the principle of induction where electromagnetic field is induced into the rotor when rotating magnetic field of stator cuts the. When two unlike poles are brought near each other, if the.
Squirrel cage wound rotor with slip rings the rotating magnetic field. Why are there two different designs of rotor construction for induction motors. But the rotor construction differs with respect to the type of motor. The slip ring motor has very little application in industries. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Induction motor seminar ppt, pdf report study mafia. But how does external resistance aid in better starting characteristics.
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